Roller-bearing for type-writers.



. G. W. DAVIS.

ROLLER BEARING FOR TYPE WRITERS. APPLIOATION FILED JUNE-23, 1911.

1,097,215, 4 Patented Ma 19, 1914.

ll.l Ill-11'4" COLIYJMBIA PLANOGRAPN 00-,WASHINCITON, D. C.

UNITED STATES PATENT ()FFICE.

GEORGE WILLIAM DAVIS, OF WESTIVIOUNT, QUEBEC, CANADA.

ROLLER-BEARING FOR TYPE-WRITERS.

Specification of Letters Patent.

Original application filed January 3, 1907, Serial No. 350,637. Dividedand this application filed June 23,

To all whom it may concern:

Be it known that I, GEORGE WILLIAM DAVIS, a subject of the King of GreatBritain, of Westmount, in the district of Montreal, Province of Quebec,Canada, have invented certain new and useful Improvements inRoller-Bearings for Type-WVriters; and I do hereby declare that thefollowing is a full, clear, and exact description of the same.

The object of this invention is to provide 7 new antifriction means forsupporting the carriage in its supporting frame and a carriage supportacting in conjunction with the above mentioned means to preventlostmotion between the type and the platen when they impinge upon thelatter.

For full comprehension however of my invention reference must be had tothe accompanying drawings forming a part of this specification in whichlike reference characters indicate the same parts and wherein:

Figure 1 is a vertical transverse sectional view of the carriagesupporting frame and roller bearings therefor; Fig. 2 is a perspectiveview of the cage for positioning the balls upon which the carriage runs;and Fig. 3 is an enlarged perspective view of one end of the cage.

This invention relates to that type of writing machine illustrated inpatent application Serial No. 350,637, filed January 3, 1907, of whichthis is a divisional part.

The carriage supporting frame comprises a pair of angular end framepieces d the ends of the vertical and horizontal legs of which haveupper and lower connecting bars f and g, respectively, secured theretoand constituting, with the said end pieces, an intact carriagesupporting frame. These connecting bars have rigidly secured thereto apair of rails z and j of Z-cross-section and co-acting with a secondpair 70 and Z of similar cross section secured rigidly to the end framepieces at of the carriage and forming therewith the main carriage frameand presenting with the rails 70 and Z raceways for anti-friction balls0 and 29 before menently shown.

The main carriage is supported upon the anti-friction balls 0 and pbefore mentioned, and lost motion between the type when they strike andtheir abutment (the platen is prevented by the particular means(constituted by these anti-friction balls and Serial No. 634,952.

the raceways) for supporting the same. Owing to the positions of theraceways relat vely to the center of gravity of the carriage, one beingin front thereof and the other behind, there is a tendency given to thecarriage to cant toward the rear of the machine thus causing the saidcarriage to constantly lie upon the rear balls to which the rearwardside load, due to the conditions just described, is transmitted, and asthese last named balls are mounted on the rear of the frame, such sideload, and the momentary increases thereof (due to the impingement of thetype) are exerted directly and consequently without lost motion upon theframe.

I utilize a pair of balls in each raceway, those in the forward racewaybeing indicated at 0 and those in the rear at p and these balls areretained in their proper relative positions by a movable cage consistingof a pair of arms 8 united by a cross piece 9 bent to clear the channelbar 7 of the vibratory carriage and other parts. Each end of these arms8 is formed with a square opening 10 and transversely bent lugs 11 thelatter being adapted to be acted upon by the ball located in the saidsquare opening and this action of the four balls causing the cage tomove with them and preserve their proper relative positions. This cageand the balls traveling therewith have their movement in eitherdirection limited by a series of stop screws 12 carried by the ends ofeach of the Z-rails z', y, is, Z. This is eifected if the cage shouldhappen to become displaced from its proper position relatively to thecarriage, in which case the stop screws on the rear of the latter willcatch up to it and shove it ahead and thus return it to its properposition. Or, if the cage should happen to be displaced to a wrongposition in advance, it will engage the stop screws in the ends towardwhich it is traveling of the Z-rails of the frames and be arrested, thecarriage then sliding over the balls and thus again returning the cageto its proper position. This rectifying action only takes place as informer machines when the displacement of the cage is so great that thecarriage comes upon it before the latter engages the marginal stop.

What I claim is as follows:

In a typewriter, the combination with the main frame, the carriage, theplaten upon bearing rails, to receive and position the anti-frictionballs, such upper and lower arms being formed with laterally project- 15ing lugs ateach end of said apertures.

Intestimony whereof, I have signed my name to this specification, in thepresence of two subscribing witnesses.

' GEORGE WILLIAM DAVIS.

Witnesses:

STANLEY O. KING, FRED. V. LEAU.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

